Reliabilityof Test Scorability Economy

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b.Reliabilityof Test

Reliability isone of the characteristics of good test. It refersto the consictencyofthemeasurement.NurkancanaandSumaratana1986:131state, “The reliability ofatestistheextendtowhichitgivesconsistentresultwhenappliedby different peopleorondifferentoccasions”.Itmeans thatifthescoresofthestudents arestableapplyingitbydifferentpeopleorondifferentoccasionsthenthetestis reliable. But,if the score tends to fluctuate too much, the test is unreliable. Reliability isoneofthecharacteristicsofgoodtest.Itreferstotheconsistencyofthe measurement. Lado 1961:31 says, “Reliability is measured by a correlation between thescoresofthesamesetofstudentsontwoconsecutiveadministrationsof thetest.”Itmeansthat ifthescoresofthestudentsarestableapplying itby different peopleorondifferentoccasionsthenthetestisreliable.But,ifthescoretendsto fluctuate toomuch, thetest isunreliable. Inthisresearch,Thewriterhastreated the20142015tenthyearstudents equally.Thewriterpreparedfiftyquestionsandforeachitemwouldbegiventwo point.So,everystudentwillgetscoreasshehecould.Thewriterexaminedtheir answer- sheetsinthesameway.Thewriterwillusethefollowingformulasuggested byKuder – Richarson: KRr= � ��− � [ �− � ��−�� ��.�� � ] Which: r =reliabilityof the instrument k =number of questions M = mean ofthetestscore S 2 =standard deviation 33

c. Scorability

Scorabilityinanassessmentisthemostbasicthingastodeterminewhether anassessmentisvalid.Thismeansthatwhetheragiventestscoreslateron can be accurately sothattheresultsobtainedarevalid.Intheassessmenttest,anexaminer shouldbecarefulintermsofscorabilities,becauseitisonethatissensitiveofthe assessmenttestisscoring.AccordingtoLado1961:31,“Objectivetestsareeasy to score.”Itiscausedbytheassessmentcanbemadeobjectivelybyeliminatingthe personalopinionoftheexaminer.Ifatestgetssteadily assessmentresults,withthe sameresult,doesnot changeevenif theassessmentwastobyperformed bydifferent examiners, thetest isvalid.

d. Economy

Lado1961:31saidthatifthe testmeasurewhatwewantitinareasonable timeconsidering thetesting situation,itwillbepracticalandeconomical.Itmeans thatagiventestshould haveareasonable time, not toofastand not toolong.Thetest shouldprovidesufficientinformationin accordancewith thetime that isgivenin order to thetestresultsareobtained asexpected.

e. Administrability